Protective unit.



WILLIAI DUBILIEB, F NEW YORK, N.' Y.

HWTECTIVE UNIT.

'Srdon 0f Letten Intent Patented Oct. 15, 1918.

Appuuunn ned February s, 191s. serial no. 216,327.

To all whom it may concern.'

Be it known that I, WILLIAM DUBILIER, a

citizenof the United States, `residing in the city and county of New York, State of New York, have invented a new and useful Protective Unit, of which the following is a.

specification.

My invention relates to a device for p'rotecting electrical apparatus or circuits, as

against the effects produced by fluctuating or alternatin current, and particularl I against the e ects of high frequency osci lations suchas yare roduced in or mduced -by radio telegraphic or radio telephonie ap aratus.

y invention resides 1nl a compact protective unit comprismga casing or housing of insulating material within which is disposed a condenser or a plurality of' condensers in electrical communication with one or more external conductorsof structure lsuitable for connecting the device in operative relation with the circuit or apparatus to be protected.

My inventionresides in an electrical protective device vof the character hereinafter described, and claimed.

For an illustration of one forms m to be ha to theaccompanying drawing, in which: e

Figure -1'is a top plan view of a protective device embodyin my invention.

Fig. 2 is a si e elevational view of the same. e

Fig. 3 is an end elevational view of the same.

Fig. Liis a vertical cross sectional view of the same.

Fig. 5 is a diagrammatic view illustrating a mode of connection of the protective devlce.

Referring to the drawing, A is a casing or housing of insulating material, preferably molded in a sin le unit, with a chamber or cavity form therein. The casing A has the bottom extensions or ianges B, which extend preferabl to the extreme edge of the metal 'base late havin-g the ears or lugs d by which t e device as a whole may -be fastened to any suitable support, as by screws extendin through the holes in the ears d. Carried y the side walls ofthe casing A are the metal bus bars Fand F1 into which are threaded screws's, the screw heads f and the bus bars being preferably moldedof the various inventlonmay take, reference 1s,

in the insulating material `of the casing A andso held and supported thereb To each bus bai` is secured a wire or cab e terminal H having the parts h suitably bored, as indicated 1n dotted lines in Figs. 1 and 2, to receive theends of wires or cables, as f and f1, Fig. 5. To the busbars are secured further wire or cable terminals I having the parts' also. suitably bored to receive wires or cables, as g and g1, Fig. 5. The terminals H and I may 'be secured to the bus'bars in any suitable way, as by nuts n threaded upon studs 't secured to the bus bars, these studs in the example illustratedA being the outer ends of the screws s.

As seen in Fig. 4,- the pocket or cavity -1n the casing or housing A is open at its bottom. In this chamber are placed the condenser units C andC, of any suitable structure and any'suitable number -of sections.

These condensers are preferably built upv of alternating sheets of insulating material and metal foll, the insulating material preferably being mica, and are preferably of the self-protecting type described in my application Serial Number 212,096. These con denser units are supported in position between the middle member a of insulating material and the outer members b, b, also of insulating material, the material for these members being preferably mica, of suitable number of layers or thickness. The condenser units are in effect wedged or held in place between and by these members a and b. The chamber pocket is covered or closed by the aforementioned base plate D, which is vsuitably secured, as by screws fw, to the housing or 4'casing member A after the condenser units have been put in place. On either or both ends ofthe base plate D may be secured a wire or cable terminal c for receiving a conductor as e, Fig. 5.

As indicated in Fig. 5, one terminal of each of the condenser units C, C1 connects with the base plate D; the other terminal of the unit C connects with the bus bar F, as

by connecting to the'screw s, and the other terminal of the unit C1 is similarly connected to the bus bar F1. With the wire or cable terminal c is connected a conductor e which is earthed or grounded at E. The ap.

lnected by said bus bar,

to the bus bar F; similarly, the other terminal of G is connected by Wire or cable f1 similarly connecting to the terminal H in electrical contact with the bus bar F1. The wires or cables g and g1 connect to the line or radio apparatus. Any high frequency oscillations running back upon the wiresor cables g or g1, or induced in them, readlly pass through the condenser units to ground or earth E without reaching, or at any rate, without damagin the apparatus G. v

It will be note that as part of the protective device there are provided the heavy bus bars F and F1 which form a link in each side of the circuit of generator G which carries a considerable amount of electric energy. And the terminals I of the line are always separate and distinct in a structural sense from the terminals H communicating with the machine G. Thus the protective unit forms not only a protective arrangementconnected between the line and apparatus and earth, but also affords connecting links or elements between the line and apparatus. By such structure, when the unit is removed, the line and generator are isolated from each other and are not again opy eratively connected until the insertion of a protective unit. In other words, the use of the bus bars and the separate terminals H and I afford a structure which does not readily afford connection between line and generator, except by insertion of theprotective unit. The protective unit cannot be removed Without breakin the circuit to be protected, and according y if the protective unit is burnt out or otherwise injured, its removal opens the circuit which is not restablished until insertion of a new protective unit.

Furthermore, in the arrangement illustrated, the bus bars and the connectors are on the sides of the insulating housing below the top thereof, whereby the terminals are not readily short circuited by a conductor falling or placed across the top of the casing A. Similarly, the flanges B extending to the extreme sides of the base plate D further insure against accidental grounding-or short circuiting.

What I claim is:

l. A protective unit comprising a housin of insulated material, a condenser inclose within the same, a bus bar connected withv said condenser and carried by said housing, and conductor terminals secured to and connected by said bus bar.

2. A protective unit comprising a housing of insulating material, a condenser inclosed' within the same, a bus bar connected with said condenser and carried by said housing, conductor terminals secured to and conand a base plate carrying said housing.

3. A protective unit comprising a housing A. closure for saidv chamber, a

of insulating material, a condenser inclosed within the same, a bus bar connected with said condenser and carried by said housing, conductor terminals secured to and connected by said bus bar, a base plate carryin said housing, and a connection from sai condenser to said base plate.

4. A 'protective unit comprising a housing of insulating material, a plurallty of condensers inclosed therein, busbars connected with said condense-rs and carried by said housing, conductor terminals connecting with said bus bars and with conductors of a circuit to 'be protected, and a plate with which the remaining terminals of 'said condensers are connected secured to said housing and adapted to be connected to earth.

5. A protective unitcomprising a housing of insulating material, a condenser inclosed.

therein', a bus bar molded in said housing and partly exposedon the exteriorthereof, a connection from said condenser to said bus bar, and means for connecting said bus bar to adjacent ends of one side of a circuit to be protected.

6. A protective unit comprising a housing of insulatingA material, a condenser inclosed therein, a bus bar molded in said housing and partly exposed on the'exterior thereof, a connection from said condenser to said bus bar, and means for connecting said bus bar in series with a conductor of a circuit to be protected.

7. A protective unit comprising a housing of insulating material, a condenser inclosed therein, a-bus bar molded in said housing and partly' exposed on the exterior thereof, a connection from said condenser to said bus bar, means for connecting saidl bus bar to a conductor of a circuit to be protected, and a plate secured to said housing and connected to the other terminal of said condenser. v Y

8. A protective unit comprising ablock of insulating material having a chamber, a condenser in said chamber, a late forming a us bar carried by said housing and connected with said condenser,`and means for connecting said bus bar with the conductor of a circuit to be protected. l

9. A protective unit comprisin a block of finsulating material having a c amber, a condenser in said chamber, a plate formin ar closure forsaid chamber, a bus bar carried by said housing and connected `with said condenser, means for connecting said bus barriedhby said housing and connected to said condensers, means for connecting said bus bar with conductors of a circuit to be protected, a connection from said condensers to sfid plate, and means for grounding said p 11. A protective device comprising a block of insulating material having a chamber, a condenser therein, a bus bar carried by said housing on the side thereof and below its top, a connection between said condenser and 13. A protective unit comprising a hous ing of insulating material having a chamber, a plurality of condensers therein, a base plate formin a closure for said chamber, connections rom said condensers to said plate, bus bars carried by said housing on opposite sides thereof below its top, connections from said condensers to said bus bars, and insulating material below said bus bars between the same and said plate. y

14. A protective unit comprising a housing of insulatingmaterial having a chamber, a plurality of condensers therein, a base plate formin a closure for said. chamber, connections rom said condensers to said plate, bus bars carried by said housing on opposite sides thereof below its top, connections from said condensers to said bus bars, insulating material below said bus bars between the same and said plate, and means for grounding said plate. p 15. A protective device comprising a housing of insulating material havmg a chamber,

a condenser in said chamber, and a conducting member carried by said housing and conneeted with one terminal of said condenser,

said member aifordin means for connecting together ad]acent en s of one side of a circuit to be protected by said condenser.

16. A protective device comprising a housing of insulating material, oondensers inclosed therein, conductors, one for each condenser, carried by said housing and connected to said condensers, and means for connecting adjacent ends of one side of a circuit to be protected to each of said members.

17. A protective device comprising a housing of insulating material, condensers inclosed therein, conductors, one for each condenser, carried by said housing and conn'ectedv to said condensers, means for connect- `ing adjacent ends of one side of a circuit to be protected to each of said members, a plate secured to said housing andv connected to the remaining terminals of said condensers, and means for connecting said plate to earth. v

18. A protective unit comprising a housing, a condenser inclosed therein, a bus bar carried by said housing and connected with said condenser, and means for connecting adjacent ends of one side of a circuit to be` protected by said condenser to separated 'points on said bus bar.

19. A protective unit comprising a housing of insulating material, condensers inclosed therein, means for connecting a'terminal of each of said'condensers to earth2 a bus bar for each of said condensers carried by said housing and connected to the remaining terminal of a condenser, and means for connecting to separated oints of each bus bar adjacent terminals o one sideof a\ circuit to be protected.

In testimony whereof I have hereunto aixed my signature this 7 day of/February,

WILLIAM DUBILIER. 

